ESTIMATEDDate confidence: ESTIMATEDA target, not a fixed dateHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all ESTIMATED pins65% CONFIDENCEOverall confidence: 65%How well the pin's source and references back up its dates.Weighted average of how firmly 4 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins from 50% to 74% confidence
A target, per the source[1]: the collider is "expected to become operational in the early to mid-2030s". Construction start: Brookhaven Lab, 13 Apr 2026: "Work begins today ... to remove components from the Relativistic Heavy Ion Collider (RHIC)" - "the first step in transforming the renowned collider into ... the Electron-Ion Collider (EIC)"; the old 2033 date was the source's hoped-for operation, not a construction date. Completion: DOE Office of Science FY 2027 Congressional Justification (Nuclear Physics, May 2026), 20-SC-52 EIC: "The estimated completion date (CD-4) of 1Q FY 2036 includes schedule contingency validated by peer review" (1Q FY 2036 = Oct-Dec 2035; CD-4 = "Approve Start of Operations or Project Closeout").Brookhaven National Laboratory is building the Electron-Ion Collider inside its existing RHIC tunnel, a $1.7-2.8BN US physics megaproject to study the glue holding matter together.
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